Answer:
i believe the smooth i could be wrong tho:)
Explanation:
The muscle pulling on a bone often works like a type of simple machine called a lever. Most of the bones of the limbs (arms & legs) act as levers for the body. I hope that this is the answer that you were looking for and it has helped you.
B. 245 million
from the end of Carboniferous Period to the beginning of the Triassic period
